Some internet crazes look like fun and some are just weird – but experts have warned that people are risking their lives by performing the latest stunt called ‘Neknominate’.

Drinkers are posting videos of themselves downing huge amounts of alcohol – including strong lager, vodka and bottles of Jagermeister – before ‘nominating’ someone else to try to outdo them.

A Facebook group called ‘Valleys neck and nominate’ has attracted almost 1,000 likes and features clips such as ‘Pommy lad destroys a straight bottle in record timing’ and people drinking urine – but doctors have warned the levels of booze being downed could be fatal.

In one video, a man is seen apparently biting the head off a dead chicken before eating it.

He said the bird – called Donald – was killed when he was one day old.

He is also seen downing a can of premium Kestrel lager and almost a pint of vodka containing three raw eggs and a cigarette he has just stubbed out on his tongue.

He then snorts a spoonful of body building supplement creatine because he wants to get ‘psyched up’ before drinking the disgusting cocktail.

The potentially fatal craze has also seen people drinking their own urine and downing a pint of Sambuca.

The Welsh boozer bites the head off a dead bird in the stomach-churning clip (Picture: YouTube)

But worried experts said the drinkers – who are mostly young men – were risking their lives.

‘This level of drinking is toxic,’ Dr Phil White, secretary of the North Wales Local Medical Committee, told walesonline.

‘It won’t just get you drunk but could kill you.’

Janet Roberts, from drug and alcohol helpline Dan 24/7, said the drinkers were playing a ‘dangerous game of Russian roulette’.

‘Someone could choke on their own vomit,’ she added.

And James Varty, acting chief executive of drugs and alcohol charity Kaleidoscope, warned people not to copy the clips.

‘It’s a very concerning game – if it grows in popularity we may well see tragedies,’ he said.

WARNING: This video contains strong language and scenes some may find disturbing